Metadata: Identification_Information: Citation: Citation_Information: Originator: Karl, N.A. Originator: Carroll, T.R. Originator: Burger, M.H. Originator: Knudsen, L.D. Originator: Long, K.R. Originator: Reyes, T.A. Originator: Schmeda, G. Publication_Date: 20200831 Title: Tungsten Deposits in the United States (ver. 2.0, August 2020) Edition: 2.0 Geospatial_Data_Presentation_Form: Vector Digital Data Set Series_Information: Series_Name: U.S. Geological Survey data release Issue_Identification: DOI: 10.5066/P97NJLI4 Publication_Information: Publication_Place: Denver, CO Publisher: USGS ScienceBase Other_Citation_Details: Suggested citation: Karl, N.A., Carroll, T.R., Burger, M.H., Knudsen, L.D., Long, K.R., Reyes, T.A., and Schmeda, G., 2020, Tungsten Deposits in the United States (ver. 2.0, August 2020): U.S. Geological Survey data release, https://doi.org/10.5066/P97NJLI4. Karl, N.A., ORCID 0000-0003-2858-2498; Carroll, T.R., ORCID 0000-0002-0671-2848; Burger, M.H., ORCID 0000-0002-6254-4375; Knudsen, L.D., ORCID 0000-0003-3691-5475; Long, K.R., ORCID 0000-0002-6457-2820; Reyes, T.A., ORCID 0000-0002-0504-2571; Schmeda, G., ORCID 0000-0003-2676-1118 Online_Linkage: https://doi.org/10.5066/P97NJLI4 Description: Abstract: This is version 2.0 of Tungsten Deposits in the United States. This data release provides the descriptions of approximately 100 U.S. sites that include mineral regions, mineral occurrences (deposits), and mine features that contain enrichments of tungsten (W). This data release reports on U.S. mines and deposits with greater than or equal to 215 metric tons of tungsten metal (30,000 short ton units of tungsten trioxide). Sites in this database occur in Alaska, Arizona, California, Colorado, Idaho, Montana, North Carolina, New Mexico, Nevada, Texas, Utah and Washington. As a part of the process set forth by Executive Order 13817, the USGS National Minerals Information Center (NMIC) identified W as a critical mineral due to the import reliance and importance in the sectors of aerospace, defense, energy, and telecommunications (Department of the Interior, 2018; Fortier and others, 2018). Tungsten is necessary for strategic, consumer, and commercial applications. Due to its strength, hardness, and high melting and boiling points, W is used in wear-resistant applications, specialty steel and alloys, and electrical and chemical products. Tungsten minerals were an important part of the United States’ industrialization efforts and the domestic mining picture for a majority of the 20th century. Despite reduced domestic production, the need for W minerals and their downstream components remains high. As of 2020, the United States had a net import reliance of more than 50 percent for W, where the commodity is primarily being imported from China, Bolivia, Germany, and Spain (U.S. Geological Survey, 2020). Tungsten mineralogy is diverse; it occurs in a variety of minerals with the most common being scheelite, ferberite, and hübnerite. In the United States, W ore is most commonly derived from skarns, veins, and porphyry mineral deposits. The entries and descriptions in the database are derived from published papers, reports, data, and internet documents representing a variety of sources, including geologic and exploration studies described in State, Federal, and industry reports. Resource information extracted from older sources might not be compliant with current rules and guidelines in minerals industry standards such as National Instrument 43-101 (NI 43-101). The inclusion of a particular W mineral deposit in this database is not meant to imply that the deposit is currently economic. Rather, these deposits are included to capture the characteristics of the larger W deposits in the United States. Inclusion of material in the database is for descriptive purposes only and does not imply endorsement by the U.S. Government. The authors welcome additional published information in order to continually update and refine this dataset. Department of the Interior, 2018, Final list of critical minerals 2018: Federal Register, v. 83, no. 97, p. 23295-23296, https://www.federalregister.gov/d/2018-10667. Fortier, S.M., Nassar, N.T., Lederer, G.W., Brainard, J., Gambogi, J., and McCullough, E.A., 2018, Draft critical mineral list—Summary of methodology and background information—U.S. Geological Survey technical input document in response to Secretarial Order No. 3359: U.S. Geological Survey Open-File Report 2018-1021, 15 p., https://doi.org/10.3133/ofr20181021. U.S. Geological Survey, 2020, Mineral commodity summaries 2020: U.S. Geological Survey, 200 p., https://doi.org/10.3133/ mcs2020. Purpose: This dataset was developed as part of an ongoing effort by the U.S. Geological Survey to inventory public information on critical mineral deposits within the United States that have record of production and (or) resources above a specified cutoff limit. In the case of tungsten, the cutoff was set at 215 metric tons of tungsten metal. This represents, approximately the largest 10 percent of known U.S. deposits. These geospatial data provide location, geologic description, and production and resource information. In general, USGS uses this information to delineate permissive tracts (geographic areas in which specific types of mineral deposits may occur), develop assessments of potential undiscovered mineral resources, determine where and how the environmental effects of mining may be observed, and understand the natural variability found in mineral deposits of particular types. These data also support the Federal strategic objective to secure reliable supplies of critical minerals by providing information for geoscience research and mineral exploration to State and Federal agencies, private industry, and the general public. Supplemental_Information: The Esri ArcGIS 10.7.1 geodatabase contains 1 point and 2 polygon feature classes, 8 attribute tables, and 15 relationship classes. Relationship classes link tables using the Ftr_ID or Site_ID fields. Feature classes are also provided as Esri shapefiles; attribute tables are provided as Excel and comma-separated values (CSV) files. The description of each database layer (feature class) and attribute table is provided below, followed by general information about concepts and terms used in the development of the database. Metadata is provided in extensible markup language (XML), hypertext markup language (HTML), and text-formatted (TXT) formats. DATABASE LAYERS AND TABLES The Loc_Pt feature class contains point locations of mineral regions, mineral occurrences (deposits), and mine features, and the attribute information describing the location, source report, scale of the map used to obtain the location, and if the location has a polygonal footprint in the Loc_Poly feature class. In the database, all features have point locations, except for surface workings. The Loc_Poly feature class contains footprints or polygons of areas, deposits, and mining districts. If a source report shows a location as a polygon, the polygon is digitized, and the approximate centroid of the polygon is added to the Loc_Pt layer. Attribute information about the location is provided in the Loc_Pt layer. Mines are represented as points in the database, even when footprints are presented in source reports. Where possible, the approximate extent of the mining operation area, determined from imagery, is presented in the surface workings (Loc_Poly_Sw) layer. The Loc_Poly_Sw feature class contains the approximate area of mining-related activity, or "surface workings" as shown on Esri imagery. These polygonal outlines have no corresponding point location in the database, nor do they have links to other tables. The attribute information for surface workings contains the date of the imagery and basic location information including state and county names. Surface workings must be at least 1,000 feet (ft) (300 meters[m]) in one dimension to be digitized, and multiple workings that are 500 ft (150 m) or less apart are combined into one outline. No attempt is made to distinguish between the types of surface workings (for example, roads, pits, leach pads, waste piles, etc.), even when presented in source reports. The Dep_Model table contains mineral deposit model and geoenvironmental model classifications for a deposit included in the database. The Descr_Sum table contains relevant descriptions found in source reports. These descriptions are attributed according to the type of description, such as Geology, History, Production, Resources, etc. Descriptions pertain to individual features or to larger sites. The authors do not paraphrase nor combine descriptions, and therefore, when a database feature is described in multiple reports, the feature will have multiple entries. The GeolMinOcc table contains information about the geology of mineral deposits and prospects. Every attempt was made to compile information as reported in the source report. For example, if one source report states the valuable material as "chalcopyrite and scheelite", and another reports "copper carbonates", the attribute field Value_Mat will contain all values. The value in the Ref_ID field is the primary source report for the record, for example, "Hotz and Willden (1964)". All information in the record comes from the primary source report unless an attribute field value contains a number in parentheses. This number denotes another source report whose Ref_ID is given in the Remarks field. Full citations for source reports are provided in the References table and adhere to USGS citation style. The History table contains information derived from publicly available sources regarding the status of a mineral region, mineral occurrence, or mine feature through time. Values in the Status field indicate a condition or phase for the time period stated in the Year_From and Year_To fields. This information may not reflect the current status of a feature. For example, if the attribute record shows the status of a mine is "Active" and the Year_From and Year_To dates are 1925 and 1956 respectively, the mine was active from 1925 to 1956; it is unknown if the mine is still active. The Last_Updt field shows the date that the record was last updated by the authors. The Production table contains published production data for mines. Production is listed by commodity and reported as shown in the source reports. Reported production values are totaled by the USGS authors for the time period defined by the Year_From and Year_To fields. If production is reported for a group of features, the Ftr_ID will show "-1111" and the production is assigned to the "site" or Site_ID that groups those mines on the Site table. The contained SI commodity amount (CntSIComAm) for the contained SI commodity (CntSICom) has been provided in one consistent unit (metric tons) for the user which is typically calculated by USGS authors. A value ending with "111" as a decimal trailer indicates the value was calculated by USGS authors. For example, if a grade is calculated by USGS authors to be 0.05 percent, the value recorded in the database will be 0.05111. Conversion factors used by USGS authors can be found on the USGS_Tungsten_ver2_Merged_Excel file under the Conversions tab. Decimal trailers are not reported in the Entity and Attribute section for ranges. Where a range in values are provided for attribute fields such as Mat_Amnt, Grade, Contained, etc., the average of the range is reported within the field and the range of values are noted within the Remarks field. For consistency, production values are converted to the SI units by the USGS authors. The References table contains the citation of the map or report(s) from which the point, polygon, or attribute information is obtained. The table also assigns a short reference (Ref_ID) that is used throughout the database. This table does not have a relationship class allowing the user to relate to other tables since Ref_IDs from tables such as the Production table may have multiple references. The Resources table contains reported resource data for mineral deposits. Data are compiled for the most recent mineral resource when available. Resource values were recorded as shown in source reports, including year reported, resource amount, units, and classification system(s). The definition of terms (for example, inferred, proven, probable, etc.) used in various resource classification systems may change through time. Resources extracted from older sources might not be compliant with current rules and guidelines in minerals industry standards such as NI 43-101 or the Joint Ore Reserves Committee Code (JORC Code). The way the resource is reported dictates the number of records for each deposit. For example, if data from a single deposit are reported for an inferred resource and a proven reserve, data from both classifications will be reported as separate records, unless it is stated that the proven reserve is inclusive of the inferred resource. If resource data are reported for a group of features rather than an individual deposit, the Ftr_ID will show "-1111" and the resource is assigned to the "site" or Site_ID that groups those deposits on the Site table. The CntSIComAm for the CntSICom has been provided in one consistent unit (metric tons) for the user which is typically calculated by USGS authors. A value ending with "111" as a decimal trailer indicates the value was calculated by USGS authors. For example, if a value in the Grade field is calculated by USGS authors to be 0.05 percent, then the value recorded in the database will be 0.05111. Conversion factors used by the USGS authors can be found on the USGS_Tungsten_ver2_Merged_Excel file under the Conversions tab. Decimal trailers are not reported in the Entity and Attribute section for ranges. Where a range in values is provided for attribute fields such as Mat_Amnt, Grade, Contained, etc., the average of the range is reported within the field and the range of values is noted within the Remarks field. For consistency, resource values are converted to the International System of Units (SI units) by the USGS authors. Inclusion of material in the database is for descriptive purposes only and does not imply endorsement by the U.S. Government. The Site table is used to identify related features, such as a deposit and the mine(s) operating on it, or a mine and its related deposits. Each site has a unique identification value in the Site_ID field. A Site_ID is also assigned to mineral regions, such as mining districts, which are represented as a single polygon or point feature in the database. The Site_ID is used in all tables except the References table and Loc_Poly_Sw feature class. The Site table also indicates where information about a site occurs within the database. For example, if the Resources field in the Site table contains the value "Yes", resource information is available in the Resources table. GENERAL INFORMATION Mineral regions may be a mineralized area, a mineral district, or a mining district. Mineral areas have similar geology and deposit types. Mineral districts are usually named and are defined by a group of deposits of similar type, origin, and (or) commodity. Mining districts represent historic administrative areas organized by miners under the mining laws of the United States. Mining districts are typically an area containing a group of mines that exploited the same or related commodity. Mining district polygons may overlap. Mine features are man-made features associated with the process of extracting, processing, or concentrating ore materials. In this database, mine features have a point location, and where possible, the polygon boundary showing the extent of surface workings identified from imagery. No attempt is made to distinguish specific mine features like pits, dumps, tailings, etc. within the surface workings outline. Mineral occurrences, defined as a concentration of a mineral considered potentially valuable, can be deposits, prospects, or showings in USGS mineral deposit databases (USMIN). Mineral deposits have a defined size and may have a grade indicated by current and (or) past production, and (or) a resource estimate. The locations of mineral regions, mine features, and mineral occurrences are commonly represented as points in source maps and reports, and occasionally as footprints (polygon outlines). In this database, all features have a point location, and some have an additional polygonal footprint. Surface workings in the Loc_Poly_Sw feature class are the exception—they do not have a corresponding point location or attribute information in the Loc_Pt feature class. Otherwise, for points that have polygonal boundaries, the Loc_Pt feature class attribute field Loc_Poly contains the value "Yes" and the boundary definition is described in the field Poly_Def field. For example, "Approximate extent of the mining district from the map", or "Outline of scheelite-bearing tactite on map". Each point and polygon feature is uniquely identified by a Ftr_ID. The Site_ID is used to indicate groups of related features, or "sites". Tables are linked (related) using the Ftr_ID or the Site_ID fields. Some tables have more than one record describing a feature. For example, a point denoting a mine location may have many records in the Production table summarizing the dates and amounts of material produced. The database is designed to allow the user to navigate from the point or polygon layers to the linked table information or from the tables to the point and polygon layers. All data are derived from publicly available sources. The Last_Updt field shows the date that the record was last updated by the USGS authors. Full citations are listed in the References table, and each citation is assigned a short citation (Ref_ID) that is used for identification in the database. Except for the Loc_Poly feature class, the primary reference(s) is noted in the Ref_ID field. Additional references are enumerated after attribute field values, and the corresponding short reference is in the Remarks field. For example, the Commodity field shows "copper; gold (1); silver (1); tungsten". This indicates the commodities "copper and tungsten" are derived from the primary reference denoted in the Ref_ID field as "Pattee (1960)" and "gold and silver" is derived from a secondary reference denoted in the Remarks field as "(1) Geach (1972)". In the GeolMinOcc table, lists in different fields may not correspond. For example, if the Commodity field shows "copper; tungsten", the Value_Mat field may list the associated ore minerals in a different order. The data in lists are alphabetized to prevent duplication of values as authors compile the dataset, with individual values separated by semicolons. Listed fields are present in the Site, Loc_Pt, and GeolMinOcc tables. Field or attribute records that contain "Null" values in the file geodatabase were checked for available data and no data were found. In some cases, an entire field may contain no information. These "Null" fields are maintained in the database structure for consistency with related USGS products and for possible future use if information becomes available. Additionally, values in the fields Commodity, and Material may be lumped into groups such as platinum-group elements (PGE). For the purpose of the USMIN database, the PGE group includes the commodities iridium (Ir), osmium (Os), palladium (Pd), platinum (Pt), rhodium (Rh), ruthenium (Ru). Two points may occupy the same location. This occurs when there is a deposit with a mine, and the location of either the mine or the deposit is unknown. For example, a report provides a map showing the location of a deposit. The report also provides production data for underground "Mine X" that is associated with the deposit but does not provide the location of "Mine X". In this case, a second point representing "Mine X" is placed at the point location of the deposit. Polygon features may overlap. Viewing polygons as outlines without color fills will show where polygon overlap occurs. In the attribute section of this metadata, attribute fields from all feature classes and tables are listed in alphabetic order; corresponding feature classes and tables are listed in parentheses after the field name in the Attribute Label. For example, "Mat_Amnt (Production, Resources)" indicates the attribute field Mat_Amnt occurs in the Production table and in the Resources table. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1933 Ending_Date: 2020 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -147.402 East_Bounding_Coordinate: -78.4712 North_Bounding_Coordinate: 66.261 South_Bounding_Coordinate: 31.421 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: location Theme_Keyword: economy Theme: Theme_Keyword_Thesaurus: Alexandria Digital Library Feature Type Thesaurus Theme_Keyword: mineral deposit areas Theme_Keyword: mine sites Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: economic geology Theme_Keyword: geographic information systems Theme_Keyword: geospatial datasets Theme_Keyword: metallic mineral resources Theme_Keyword: mineral deposits Theme_Keyword: mineral resources Theme_Keyword: natural resource exploration Theme_Keyword: antimony Theme_Keyword: arsenic Theme_Keyword: beryllium Theme_Keyword: copper Theme_Keyword: gold Theme_Keyword: iron Theme_Keyword: lead Theme_Keyword: lithium Theme_Keyword: molybdenum Theme_Keyword: niobium Theme_Keyword: rhenium Theme_Keyword: silver Theme_Keyword: sulfur Theme_Keyword: tin Theme_Keyword: titanium Theme_Keyword: tungsten Theme_Keyword: vanadium Theme_Keyword: zinc Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Department of the Interior (DOI) Theme_Keyword: U.S. Geological Survey (USGS) Theme_Keyword: Energy and Minerals Mission Area Theme_Keyword: Mineral Resources Program (MRP) Theme_Keyword: Region 7: Upper Colorado Basin Theme_Keyword: Geology, Geophysics, and Geochemistry Science Center (GGGSC) Theme_Keyword: USGS Mineral Deposit Database (USMIN) Theme_Keyword: Earth Mapping Resources Initiative (Earth MRI) Theme_Keyword: Bureau of Land Management (BLM) Theme_Keyword: data release Theme_Keyword: critical mineral Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: ferberite Theme_Keyword: fluorspar Theme_Keyword: hübnerite Theme_Keyword: platinum-group elements Theme_Keyword: rare-earth elements Theme_Keyword: scheelite Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: deposit type Theme_Keyword: Alluvial placer Sn Theme_Keyword: Arc-related porphyry Mo Theme_Keyword: Au-W breccia Theme_Keyword: Brine Theme_Keyword: Climax Mo deposits Theme_Keyword: Disseminated pluton Au-Sb Theme_Keyword: Epithermal Mn Theme_Keyword: Placer Au-W Theme_Keyword: Polymetallic veins Theme_Keyword: Porphyry Cu Theme_Keyword: Porphyry Mo-Cu Theme_Keyword: Porphyry Mo-Nb Theme_Keyword: Replacement in calcareous schists Au-Ag-Sb Theme_Keyword: Sn greisen deposits Theme_Keyword: Sn skarn deposits Theme_Keyword: W skarn deposits Theme_Keyword: W veins Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Adit Theme_Keyword: Area Theme_Keyword: Brine Mine Theme_Keyword: Deposit Theme_Keyword: Mine Feature Theme_Keyword: Mineral District Theme_Keyword: Mineral Occurrence Theme_Keyword: Mineral Region Theme_Keyword: Mine Shaft Theme_Keyword: Mining District Theme_Keyword: Open Pit Mine Theme_Keyword: Placer Mine Theme_Keyword: Underground Workings Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:5e3dce84e4b0edb47be3d6a6 Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Alaska Place_Keyword: Arizona Place_Keyword: California Place_Keyword: Colorado Place_Keyword: Idaho Place_Keyword: Montana Place_Keyword: North Carolina Place_Keyword: New Mexico Place_Keyword: Nevada Place_Keyword: Texas Place_Keyword: Utah Place_Keyword: Washington Place: Place_Keyword_Thesaurus: Common geographic areas Place_Keyword: United States Access_Constraints: None. Please see 'Distribution Info' for details. Use_Constraints: Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jeffrey L. Mauk Contact_Organization: U.S. Geological Survey, Rocky Mountain Region Contact_Position: Research Geologist Contact_Address: Address_Type: mailing address Address: PO Box 25046, Mail Stop 973 City: Lakewood State_or_Province: CO Postal_Code: 80225 Country: US Contact_Voice_Telephone: 303-236-5605 Contact_Facsimile_Telephone: 303-236-3200 Contact_Electronic_Mail_Address: jmauk@usgs.gov Data_Set_Credit: The data sets were developed by the U.S. Geological Survey Geology, Geophysics, and Geochemistry Science Center (GGGSC) with support from the Bureau of Land Management Solid Minerals Program. Database reviews and contributions were made by USGS personnel Stu Giles, David John, Jeff Mauk and Kim Shedd. Native_Data_Set_Environment: Environment as of Metadata Creation: Microsoft [Unknown] Version 6.2 (Build 9200); Esri ArcGIS 10.7.1 (Build 11595) Service Pack N/A (Build N/A) Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Unique values in attribute fields were checked through frequency analyses. The unique values in each attribute field were reviewed and checked for spelling, consistency of terms, accuracy, adherence to established vocabularies, and completeness. Values calculated by USGS authors were reviewed and verified. Further information regarding calculations can be obtained from USGS authors. Floating-point numerical values may be reported to 8 decimal places. Default setting in the ArcGIS geodatabase which typically show 6 decimal places, may be formatted to show the full numerical value. When converting from an ArcGIS file geodatabase attribute table to Excel, precision of numeric values may change. The values from the ArcGIS file geodatabase are accurate and should be used for any calculations or analyses. Logical_Consistency_Report: The locations of mineral regions, mine features, and mineral occurrences (deposits) are represented as points, and some of these point locations have corresponding "footprints" or polygonal outlines. The polygonal footprint may represent the approximate outline of a mineral occurrence or mineral region. The exceptions are areas disturbed by mining-related activity, or surface workings, which are derived from imagery rather than published reports. Surface working outlines have no corresponding point location, nor do they have links to other tables. Polygonal outlines, except for surface workings, may overlap. Overlapping surface workings are merged into a single outline. Surface workings do not distinguish different types of mine features, such as pits, tailings piles, dumps, etc. Two points may occupy the same location. This occurs when there is a deposit with a mine, and the central location of either the mine or the deposit is unknown. For example, a report provides a map showing the location of a deposit. The report also provides production data for underground "Mine X" that is mining the deposit but does not provide the location of "Mine X". In this case, a second point representing "Mine X" is placed at the point location of the deposit. Completeness_Report: Mineral region, mine feature, and mineral occurrence geospatial and attribute data are compiled for the United States. Data are limited to publicly available sources for the time period between 1933 and 2020. Common literature sources include government and private industry annual reports, NI 43-101 reports, journal articles, company websites, and USGS publications. To more completely populate the Production and Resources tables, select values are calculated by USGS authors and are indicated by "111" as a decimal trailer. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Locations of features are compiled from published coordinates and by digitizing from georeferenced raster images of maps or imagery. The locational accuracy of features is dependent on the accuracy of the source maps, which generally ranged in map scale from 1:10,000 to 1:1,000,000. The scale of the source maps is recorded as "Large" for 1:24,000 scale or larger, "Medium" for maps scales between 1:24,000 and 250,000; and "Small" for scales smaller than 1:250,000, in the Loc_Scale field. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Vertical accuracy in the data set is not applicable. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: American Geosciences Institute Publication_Date: 1997 Title: Dictionary of mining, mineral, and related terms Edition: 2 Geospatial_Data_Presentation_Form: Publication (Book) Publication_Information: Publication_Place: Alexandria, VA Publisher: American Geosciences Institute Other_Citation_Details: American Geosciences Institute, 1997, Dictionary of mining, mineral, and related terms (2d ed.): Alexandria, VA, American Geosciences Institute, 646 p. Type_of_Source_Media: Digital and (or) Hardcopy Resources Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: American Geosciences Institute (1997) Source_Contribution: Reference used by the authors to develop standardized vocabularies for the database and attribute tables. The use of this reference is denoted as American Geosciences Institute (1997) in this metadata. Source_Information: Source_Citation: Citation_Information: Originator: Canadian Institute of Mining, Metallurgy and Petroleum Publication_Date: 2014 Title: CIM definition standards for mineral resources & mineral reserves Geospatial_Data_Presentation_Form: publication Publication_Information: Publication_Place: CIM Website Publisher: Canadian Institute of Mining, Metallurgy and Petroleum Other_Citation_Details: Canadian Institute of Mining, Metallurgy and Petroleum, 2014, CIM definition standards for mineral resources & mineral reserves: Canadian Institute of Mining, Metallurgy and Petroleum web page, accessed May 4, 2020, at https://mrmr.cim.org/media/1128/cim-definition-standards_2014.pdf. Online_Linkage: https://mrmr.cim.org/media/1128/cim-definition-standards_2014.pdf Type_of_Source_Media: Digital and (or) Hardcopy Resources Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2014 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Canadian Institute of Mining, Metallurgy and Petroleum (2014) Source_Contribution: Reference used by the authors to develop standardized vocabularies for the database and attribute tables. The use of this reference is denoted as Canadian Institute of Mining, Metallurgy and Petroleum (2014) in this metadata. Source_Information: Source_Citation: Citation_Information: Originator: Esri Publication_Date: 2020 Title: GIS dictionary Geospatial_Data_Presentation_Form: publication Other_Citation_Details: Esri, 2020, GIS dictionary: Esri web page, accessed May 4, 2020, at https://support.esri.com/en/other-resources/gis-dictionary. Online_Linkage: https://support.esri.com/en/other-resources/gis-dictionary Type_of_Source_Media: Digital and (or) Hardcopy Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Esri (2020) Source_Contribution: Reference used by the authors to develop standardized vocabularies for the database and attribute tables. The use of this reference is denoted as American Esri (2020) in these metadata. Source_Information: Source_Citation: Citation_Information: Originator: Klaus K.E. Neuendorf Originator: James P. Mehl, Jr. Originator: Julia A. Jackson Publication_Date: 2011 Title: Glossary of geology Edition: 5 Geospatial_Data_Presentation_Form: Publication (Book) Publication_Information: Publication_Place: Alexandria, VA Publisher: American Geosciences Institute Other_Citation_Details: Neuendorf, K.K.E., Mehl, J.P., Jr., and Jackson, J.A., 2011, Glossary of geology (5th ed.): Alexandria, VA, American Geosciences Institute, 779 p. Type_of_Source_Media: Digital and (or) Hardcopy Resources Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2011 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Neuendorf and others (2011) Source_Contribution: Reference used by the authors to develop standardized vocabularies for the database and attribute tables. The use of this reference is denoted as American Neuendorf and others (2011) in these metadata. Source_Information: Source_Citation: Citation_Information: Originator: John J. Schanz, Jr. Publication_Date: 1980 Title: The United Nations’ endeavor to standardize mineral resource classification Geospatial_Data_Presentation_Form: publication Other_Citation_Details: Schanz, J.J., Jr., 1980, The United Nations’ endeavor to standardize mineral resource classification: National Resources Forum 4, p. 307-313, https://doi.org/10.1111/j.1477-8947.1980.tb00989.x. Online_Linkage: https://doi.org/10.1111/j.1477-8947.1980.tb00989.x Type_of_Source_Media: Digital and (or) Hardcopy Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1980 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Schanz (1980) Source_Contribution: Reference used by the authors to develop standardized vocabularies for the database and attribute tables. The use of this reference is denoted as Schanz (1980) in this metadata. Process_Step: Process_Description: A literature search of publicly available mineral resource information was conducted for tungsten element deposits in the United States. Priority was given to identifying existing databases or compilations with high quality locations and data attributes that could be utilized directly in a geographic information system (GIS). The literature search identified sources of data on mines, mineral occurrences, mineral regions, and resource and production data. Relevant information was acquired, reviewed for quality and geospatial information, and digitally captured. Mines described in published reports were captured as point locations. Mining activity and production were recorded in the History and Production tables. Where possible, the approximate extent of the mining operation area was captured from imagery in the surface workings layer (see Loc_Poly_Sw). Surface workings were digitized if the ground disturbance was at least 1,000 feet (300 meters) in one dimension. The outlines of adjacent surface workings were merged if they were within 500 feet (150 meters) of one another. Mineral occurrences, defined as a concentration of a mineral considered potentially valuable, were compiled and attributed as deposits. Mineral deposits have a defined size and may have a grade indicated by current and (or) past production, and (or) a resource estimate. Mineral occurrences were represented as points and as polygons if the aerial extent or "footprint" of a deposit was available. Each polygon was attributed to describe the reported boundary type, such as the extent of the estimated resource, the grade limit or grade-thickness, or the limit of mineralization. The footprints of mineral deposits overlapped in some areas. Production and resource information is compiled as reported and consequently shows variable units. USGS authors made every attempt to provide material amount, grade, and contained commodity data. If two of the three values are reported, the missing value was calculated by the USGS authors. These values are denoted by "111" as a decimal trailer. For consistency, the three fields were converted to SI units by the USGS authors, and contained material is reported as metric tons for all commodities. Converted values are reported in fields denoted by "SI" in the field name. Where a range in values is provided for material amount, grade, etc., the average of the range is reported within the attribute field and the reported range is noted within the Remarks field. In some instances, the cut-off grade of the primary commodity determines the cut-off grade of coproducts. For example, at the Main Pipe of the Cave Peak site in Texas the reported cut-off grade is 0.06 percent Mo. The cut-off grade for all commodities is reported as "0.06 percent Mo". In some instances, the reported commodity is a compound. When this occurs, the commodity is converted to its elemental form and the converted amount is stated in SI units. For example, the commodity tungsten trioxide (WO3) is reported in the Material field. The USGS authors converted the reported quantity of WO3 to the elemental form W in SI units and populated the fields CntSIComAm and CntSIComUt accordingly. Mineral regions are attributed as areas, mineral districts, or mining districts. Areas are defined by similar geology and deposit types. Mineral districts are areas, usually designated by name, defined by a group of deposits of similar type, origin, and (or) commodity. Mining districts are historic administrative areas organized by miners under the mining laws of the United States. Mining districts are typically an area containing a group of mines that exploited the same or related commodity. Mineral region polygons may overlap. All data were spatially integrated using ArcGIS. All attribute data were compiled from publicly available sources published between 1933 and 2020. Standardized vocabularies were developed by USGS authors and include definitions from American Geosciences Institute (1997), Canadian Institute of Mining, Metallurgy and Petroleum (2014), Esri (2020), Neuendorf and others (2011), and Schanz (1980). Data were checked throughout the compilation process for accuracy of locations; and completeness, accuracy, and consistency of attributes. Process_Date: 2018 Process_Step: Process_Description: Version 2.0 Revised and reposted August 31, 2020 Version 2.0 of the database includes modifications to the format of several field values, changes to the data structure, the addition of new records, and correction of errors. These changes are described below. The format of the field Ftr_Name was expanded to include the site name. The new format is "Site name, Feature name", for example, "Boriana, Boriana deposit". The format of the field "Material" in the Resources and Production tables was expanded to include the material and the known chemical formula. For example, the material molybdenum disulfide is now presented as "molybdenum disulfide (MoS2)". The data structure was modified to place the MinReg_ID field before the Site_ID field in the Site table. The data structure was modified to include the field MinReg_ID in the Loc_Pt feature class. The data structure was modified to exclude the fields Rcvry_Amt, Rcvry_Unit, Prod_USD, RcvryAmtSI, RcvryUntSI from the Production table. Process_Date: 2020 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 183 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000001 Longitude_Resolution: 0.000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257223563 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Attribute Fields Entity_Type_Definition: The attribute fields contain attribute information associated with features or records in the data set. Attribute fields occur in data layer(s) noted in parentheses. Entity_Type_Definition_Source: USGS Authors Attribute: Attribute_Label: Alteration (GeolMinOcc) Attribute_Definition: Alteration: associated with the mineralization of the mineral occurrence. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "argillic", for a single-entry record, and "argillic; sericitic; silicification" for a multiple entry record. Attribute: Attribute_Label: Approx_Lat (Site) Attribute_Definition: Approximate latitude: the approximate latitude of the center of the site area. The coordinates are provided in the WGS 84 geographic coordinate system. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 31.432264 Range_Domain_Maximum: 65.532265 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: Approx_Lon (Site) Attribute_Definition: Approximate longitude: the approximate longitude of the center of the site area. The coordinates are provided in the WGS 84 geographic coordinate system. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -167.166489 Range_Domain_Maximum: -78.471161 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: Area_Acres (Loc_Poly, Loc_Poly_Sw) Attribute_Definition: Area acres: the approximate area reported in U.S. acres. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.78 Range_Domain_Maximum: 25741640.59 Attribute_Units_of_Measure: Acre Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Area_SqKm (Loc_Poly, Loc_Poly_Sw) Attribute_Definition: Area square kilometers: the approximate area reported in square kilometers. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.003 Range_Domain_Maximum: 104172.723 Attribute_Units_of_Measure: Square kilometer Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: Assoc_Dep (Production) Attribute_Definition: Associated deposit: the Feature identification (Ftr_ID) of the deposit from which production occurred. The format for this field is "Mo" followed by a 5-digit number. The value "Null" is used for mineral region (Mr) features. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field value is "Mo00001". Attribute: Attribute_Label: Assoc_Mat (GeolMinOcc) Attribute_Definition: Associated material: the material occurring with the valuable material(s) (minerals or rocks) but not considered ore or valuable. This is the same as gangue for metallic mineral deposits. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "quartz", for a single-entry record, and "pyrite; quartz" for a multiple entry record. Attribute: Attribute_Label: CntSICom (Production, Resources) Attribute_Definition: Contained SI commodity: the Contained commodity of the Material reported by the source document. If the Contained commodity is reported as a compound, USGS authors convert the compound to its elemental form. For example, if the commodity is reported as tungsten trioxide (WO3), elemental W is calculated from WO3 and reported. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "W". Attribute: Attribute_Label: CntSIComAm (Production, Resources) Attribute_Definition: Contained SI commodity amount: the amount of Contained commodity converted to metric tons. If the commodity is reported as a compound, USGS authors convert the amount to the elemental amount. Calculated values are denoted by a "111" decimal trailer. Values in the Production table range from 0.00003 to 980,000 metric tons. Values in the Resources table range from 0.2 to 6,540,000 metric tons (shown below ). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.2 Range_Domain_Maximum: 6,540,000 Attribute_Units_of_Measure: metric tons (CntSIComUt). Attribute: Attribute_Label: CntSIComUt (Production, Resources) Attribute_Definition: Contained SI commodity unit: the unit of the Contained SI commodity amount (CntSIComAm). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: metric tons Enumerated_Domain_Value_Definition: An SI unit of mass equal to 1,000 kilograms. Also known as "tonnes". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: COG_SI (Production, Resources) Attribute_Definition: Cut-off grade SI: the Cut-off grade (CutOffGrad) reported by the source document (COG), converted to elemental grade in International System of Units (SI) where appropriate. Calculated values are denoted by a "111" decimal trailer. The single value reported in the Production table is 0.5 percent. Values in the Resources table range from 0.006 to 1,500 with variable units (shown below). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.006 Range_Domain_Maximum: 1,500 Attribute_Units_of_Measure: See COU_SI Attribute: Attribute_Label: Commodity (GeolMinOcc, Loc_Pt, Site) Attribute_Definition: Commodity: the commodity(ies) present or associated with the feature (mineral occurrence [Mo], mine feature [Mf], or mineral region [Mr]). Commodity values represent commodities in which the database has quantitative production and (or) resource data. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "tungsten" for a single-entry record, and "gold; tungsten" for a multiple entry record. Attribute: Attribute_Label: Cont_Units (Production, Resources) Attribute_Definition: Contained units: the unit of mass reported by the source document for the Contained field. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: grams Enumerated_Domain_Value_Definition: An SI unit of mass equal to one thousandth of a kilogram. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: kilograms Enumerated_Domain_Value_Definition: The SI base unit of mass. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: metric tons Enumerated_Domain_Value_Definition: An SI unit of mass equal to 1,000 kilograms. Also known as "tonnes". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: pounds Enumerated_Domain_Value_Definition: An imperial unit of mass equal to 16 ounces. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: short ton units Enumerated_Domain_Value_Definition: A unit of mass equal to 20 pounds. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: short tons Enumerated_Domain_Value_Definition: An imperial unit for mass that is equal to 2,000 pounds. Also known as "tons". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: tonnes Enumerated_Domain_Value_Definition: An SI unit of mass equal to 1,000 kilograms. Also known as "metric tons". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: tons Enumerated_Domain_Value_Definition: An imperial unit for mass that is equal to 2,000 pounds. Also known as "short tons". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: troy ounces Enumerated_Domain_Value_Definition: A unit for mass that is equal to 31.10348 grams. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Contained (Production, Resources) Attribute_Definition: Contained: the amount of the commodity present in the ore. Calculated values are denoted by a "111" decimal trailer. Values in the Production table range from 1 to 324,827,000 with variable units. Values in the Resources table range from 3.2 to 3,812,900,000 with variable units (shown below). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3.2 Range_Domain_Maximum: 3,812,900,000 Attribute_Units_of_Measure: See Cont_Units. Attribute: Attribute_Label: COU_SI (Production, Resources) Attribute_Definition: Cut-off unit SI: the Cut-off unit (CutOffUnit) converted to International System of Units (SI). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: $US per metric ton Enumerated_Domain_Value_Definition: An imperial unit for cut-off, defined by U.S. dollars divided by metric tons. Also known as "$US per tonnes". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: grams per metric ton Au Enumerated_Domain_Value_Definition: An SI derived unit of density defined as the mass of Au in grams divided by the mass in metric tons of rock. Also known as "grams per tonne Au". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: parts per million WO3 Enumerated_Domain_Value_Definition: The mass of WO3 per million units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: percent Mo Enumerated_Domain_Value_Definition: The mass of Mo per 100 units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: percent Sn Enumerated_Domain_Value_Definition: The mass of Sn per 100 units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: percent WO3 Enumerated_Domain_Value_Definition: The mass WO3 per 100 units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: RCV $US Enumerated_Domain_Value_Definition: The recovery unit in U.S. dollars. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: County (Loc_Pt, Loc_Poly_Sw) Attribute_Definition: County: the name of the U.S. county where the feature is located. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "Humboldt", for a single-entry record, and "Humboldt; Pershing", for a multiple entry record. Attribute: Attribute_Label: CutOffGrad (Production, Resources) Attribute_Definition: Cut-off grade: the grade below which resources are not estimated or production did not occur, as reported by the source document. Calculated values are denoted by a "111" trailer. The single value reported in the Production table is 0.5 percent. Values in the Resources table range from 0.006 to 1,500 with variable units (shown below). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.006 Range_Domain_Maximum: 1,500 Attribute_Units_of_Measure: See CutOffUnit Attribute: Attribute_Label: CutOffUnit (Production, Resources) Attribute_Definition: Cut-off unit: the unit reported by the source document for the Cut-off grade (CutOffGrad) field. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: $US per ton Enumerated_Domain_Value_Definition: An imperial unit for cut-off, defined by U.S. dollars divided by tons. Also known as "$US per short tons". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: parts per million WO3 Enumerated_Domain_Value_Definition: The mass of WO3 per million units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: percent Mo Enumerated_Domain_Value_Definition: The mass of Mo per 100 units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: percent Sn Enumerated_Domain_Value_Definition: The mass of Sn per 100 units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: percent WO3 Enumerated_Domain_Value_Definition: The mass of WO3 per 100 units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: RCV $US Enumerated_Domain_Value_Definition: The recovery unit in U.S. dollars. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: troy ounces per ton Au Enumerated_Domain_Value_Definition: A unit of density defined as the mass of Au in troy ounces divided by the mass in tons of rock. Also known as "troy ounces per short tons Au". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Dep_Model (Site) Attribute_Definition: Deposit model: indicates if information for a site is available in the Dep_Model table. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: Information is available in the Dep_Model table. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: No information is available in the Dep_Model table. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Descr (Descr_Sum) Attribute_Definition: Description: detailed information that either expands or presents additional information on a feature or a site. Descriptions extracted from source documents are denoted with quotations (""). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Detailed description as reported by the source document. Attribute: Attribute_Label: Descr_Sum (Site) Attribute_Definition: Description summary: indicates if information is available in the Descr_Sum table. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: Information is available in the Descr_Sum table. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: No information is available in the Descr_Sum table. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Descr_Type (Descr_Sum) Attribute_Definition: Description type: indicates which table or feature class a Description (Descr) refers to. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples of values in this field include "Site" or “GeolMinOcc”. Attribute: Attribute_Label: DpMd_NoNm (Dep_Model) Attribute_Definition: Deposit model number and (or) name: the deposit model classification assigned to the deposit. Deposit model names starting with numbers are formal USGS classifications. Deposit models with common names are described by text only. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples: "14a - W skarn deposits" is a deposit model classified by the USGS; "Porphyry Mo-Nb" is a deposit model not classified by the USGS. Attribute: Attribute_Label: DpMd_RefID (Dep_Model) Attribute_Definition: Deposit model reference identification: a short citation for the source report that identifies a deposit with an associated deposit model. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "Still (1991)" for a single author, "Lovering and Tweto (1953)" for two authors, and "Becker and others (2019)" for more than two authors. Attribute: Attribute_Label: Ftr_Group (Loc_Pt) Attribute_Definition: Feature group: the group to which a feature belongs, such as mine feature, mineral occurrence, or mineral region. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mine Feature Enumerated_Domain_Value_Definition: A point feature representing a mine, or a location where ore materials are extracted, processed, or concentrated. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mineral Occurrence Enumerated_Domain_Value_Definition: A point feature representing a deposit, prospect, or showing. A location where useful minerals or materials might be concentrated in sufficient quantity to be exploited. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mineral Region Enumerated_Domain_Value_Definition: A point that represents the center of a mineralized area, typically defined by a group of mines or mineral deposits or a geological environment permissive for mineral deposits. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Ftr_ID (Dep_Model, Descr_Sum, GeolMinOcc, History, Loc_Poly, Loc_Poly_Sw, Loc_Pt, Production, Resources) Attribute_Definition: Feature identification: a unique alpha-numeric value assigned to each feature. The ID starts with Mf (mine feature), Mo (mineral occurrence), Mr (mineral region), or Sw (surface workings) followed by a 5-digit number. A "-1111" value indicates that the record pertains to a group of related features. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "Mf00001" for a mine feature, "Mo00001" for a mineral occurrence, "Mr00001" for a mineral region, and "Sw00001" for a surface workings. Attribute: Attribute_Label: Ftr_Name (Dep_Model, GeolMinOcc, History, Loc_Poly, Loc_Poly_Sw, Loc_Pt, Production, Resources) Attribute_Definition: Feature name: the current (preferred) name of the mine feature (Mf), mineral occurrence (Mo), or mineral region (Mr). The format for mine features and mineral occurrences is "Site Name, Feature name". Mineral regions have the name of the Site name (Site_Name) listed in the Site table. Surface working polygons in the Loc_Poly_Sw feature class are simply called “Surface Workings”. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "Climax, Climax mine" for a mine feature, "Climax, Climax deposit" for a mineral occurrence, "Climax District" for a mineral region; and "Surface Workings" for a surface workings. Attribute: Attribute_Label: Ftr_Type (GeolMinOcc, Loc_Pt) Attribute_Definition: Feature type: the type of mine feature, mineral occurrence, or mineral region feature. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Adit Enumerated_Domain_Value_Definition: A horizontal passage from the surface into a mine. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Area Enumerated_Domain_Value_Definition: Area of similar geology and deposit types. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Brine Mine Enumerated_Domain_Value_Definition: The extraction of valuable materials through a well from which brine is pumped to the surface. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Deposit Enumerated_Domain_Value_Definition: A mineral occurrence with grade and size as determined by a reserve, a resource estimate, or by production history. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mine Shaft Enumerated_Domain_Value_Definition: A vertical or inclined excavation through which a mine is worked. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mineral District Enumerated_Domain_Value_Definition: An area, usually designated by name, defined by a group of deposits of similar type, origin, or commodity. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mining District Enumerated_Domain_Value_Definition: A section of country usually designated by name, having described or understood boundaries within which minerals are found and worked under rules and regulations prescribed by the miners therein. There is no limit to its territorial extent and its boundaries may be changed if vested rights are not thereby interfered with. Enumerated_Domain_Value_Definition_Source: American Geosciences Institute (1997) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Open Pit Mine Enumerated_Domain_Value_Definition: Surficial mine, in which the valuable rock is exposed by removal of overburden. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Placer Mine Enumerated_Domain_Value_Definition: The extraction and concentration of heavy metals or minerals from placer deposits by various methods, generally using running water. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Underground Workings Enumerated_Domain_Value_Definition: A mine feature that is specified by the data source as "underground workings", or a group of underground mine features such as drifts, stopes, winzes, levels, etc. These features are projected to the surface. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: GEM_Name (Dep_Model) Attribute_Definition: Geoenvironmental model name: the associated USGS geoenvironmental model. The value "Unclassified" denotes deposits that do not have a defined geoenvironmental model. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Sn and (or) W skarn and replacement deposits". Attribute: Attribute_Label: GEM_RefID (Dep_Model) Attribute_Definition: Geoenvironmental model reference identification: the short reference of the source report that provides geoenvironmental descriptions that are associated with a deposit model. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "Mosier and Campbell (1995)" for two authors, and "Cox and others (1995)" for more than two authors. There are no records with single author entries. Attribute: Attribute_Label: GeolMinOcc (Site) Attribute_Definition: Geology mineral occurrence: indicates if information for a site is available in the GeolMinOcc table. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: Information is available in the GeolMinOcc table. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: No information is available in the GeolMinOcc table. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Grade (Production, Resources) Attribute_Definition: Grade: the reported numerical grade of the deposit. When appropriate, Grade values are calculated by USGS authors. These values are denoted by a "111" decimal trailer. Grade values range from 0.000221 to 70 in the Production table with variable units. Grade values range from 0.005 to 190 in the Resources table with variable units (shown below). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.005 Range_Domain_Maximum: 190 Attribute_Units_of_Measure: See Grade_Unit. Attribute: Attribute_Label: Grade_Unit (Production, Resources) Attribute_Definition: Grade unit: the unit of the reported Grade field. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: grams per cubic meter Enumerated_Domain_Value_Definition: An SI derived unit of density defined by mass in grams divided by volume in cubic meters. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: grams per metric ton Enumerated_Domain_Value_Definition: An SI derived unit of density defined by mass in grams divided by mass in metric tons. Also known as "grams per tonne". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: grams per metric tonne Enumerated_Domain_Value_Definition: An SI derived unit of density defined by mass in grams divided by mass in metric tonnes. Also known as "grams per metric ton". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: parts per billion Enumerated_Domain_Value_Definition: The mass of an element or compound (e.g. WO3) per billion units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: parts per million Enumerated_Domain_Value_Definition: The mass of an element or compound (e.g. WO3) per million units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: percent Enumerated_Domain_Value_Definition: The mass of an element or compound per 100 units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: pounds per cubic yard Enumerated_Domain_Value_Definition: An imperial unit of density defined by mass in pounds divided by volume in cubic yards. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: troy ounces per short ton Enumerated_Domain_Value_Definition: A unit of density defined by mass in troy ounces divided by mass in short tons. Also known as "troy ounces per ton". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: troy ounces per ton Enumerated_Domain_Value_Definition: A unit of density defined by mass in troy ounces divided by mass in tons. Also known as "troy ounces per short tons". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: GradeSI (Production, Resources) Attribute_Definition: Grade SI: the Grade converted to elemental amount in International System of Units (SI). Calculated values are denoted by a "111" decimal trailer. Values in the Production table range from 0.000181 to 250 with variable SI units. Values in the Resources table range from 0.005 to 190 with variable SI units (shown below). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.005 Range_Domain_Maximum: 190 Attribute_Units_of_Measure: See GradUnitSI. Attribute: Attribute_Label: GradUnitSI (Production, Resources) Attribute_Definition: Grade unit SI: the units of Grade SI (GradeSI). The format for this field is text and values are not abbreviated. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: grams per cubic meter Enumerated_Domain_Value_Definition: An SI derived unit of density defined by mass in grams divided by volume in cubic meters. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: grams per metric ton Enumerated_Domain_Value_Definition: An SI derived unit of density defined by mass in grams divided by mass in metric tons. Also known as "grams per tonne". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: kilograms per cubic meter Enumerated_Domain_Value_Definition: An SI derived unit of density defined by mass in kilograms divided by volume in cubic meters. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: parts per billion Enumerated_Domain_Value_Definition: The mass of an element or compound (e.g. WO3) per billion units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: parts per million Enumerated_Domain_Value_Definition: The mass of an element or compound (e.g. WO3) per million units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: percent Enumerated_Domain_Value_Definition: The mass of an element or compound per 100 units of total mass of rock or fluid. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: History (Site) Attribute_Definition: History: indicates if information for a site is available in the History table (e.g. periods of exploration, mining, etc.). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: Information is available in the History table. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: No information is available in the History table. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Host_Age (GeolMinOcc) Attribute_Definition: Host age: the age of the lithological unit(s) that host, are in direct contact with, or cut across the mineral occurrence. Age is recorded as it was stated in the source document, which may be in the format of millions of years (Mega-annum [Ma]) or chronostratigraphic units. When multiple ages are reported, these are further explained in the Remarks field. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "1700 Ma", "91.2 +/- 2.2 Ma" for millions of years, and "Cretaceous", "Late Cretaceous, for chronostratigraphic units. Attribute: Attribute_Label: Host_Litho (GeolMinOcc) Attribute_Definition: Host lithology: the lithological unit(s) that host, are in direct contact with, or cut across the mineral occurrence. Host lithology are reported as presented in the source document. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "alluvium" for a single-entry record, and "marble; skarn" for a multiple entry record. Attribute: Attribute_Label: Host_Name (GeolMinOcc) Attribute_Definition: Host name: the name of the lithological unit(s) that host the mineral occurrence as reported by the source document. Formal names are distinguished from informal names by use of capitalization standards. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "Idaho Springs Formation" for formal units, and "Boulder Creek granite" for informal units. Attribute: Attribute_Label: Last_Updt (Dep_Model, Descr_Sum, GeolMinOcc, History, Loc_Poly, Loc_Poly_Sw, Loc_Pt, Production, References, Resources) Attribute_Definition: Last updated: the date that the record in a table was last updated or revised by the USGS authors. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "2020-02-20". Attribute: Attribute_Label: Lat_WGS84 (Loc_Pt) Attribute_Definition: Latitude WGS 84: the point location in decimal degrees in the WGS 84 geographic coordinate system. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 31.432264 Range_Domain_Maximum: 65.532265 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: Loc_Date (Loc_Poly_Sw, Loc_Pt) Attribute_Definition: Location date: the publication year of the map or figure used to obtain a feature location. The Loc_Date value may differ from the publication date of the source document if the map or figure cites a different year. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "2020". Attribute: Attribute_Label: Loc_Poly (Loc_Pt, Site) Attribute_Definition: Location polygon: indicates if a point location has an associated polygon boundary in the Loc_Poly feature class. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: There is a polygon boundary. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: There is no polygon boundary. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Loc_Pt (Site) Attribute_Definition: Location point: indicates if information for a site is available in the Loc_Pt feature class. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: There is a location point. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Loc_Scale (Loc_Pt) Attribute_Definition: Location scale: the scale of the map that the location was captured from. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Small (less than 1:250,000) Enumerated_Domain_Value_Definition: The representative fraction scale of the source map is 1:250,000 or smaller. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Medium (1:24,000-1:250,000) Enumerated_Domain_Value_Definition: The representative fraction scale of the source map is between 1:24,000 and 1:250,000. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Large (greater than 1:24,000) Enumerated_Domain_Value_Definition: The representative fraction scale of the source map is 1:24,000 or larger. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Long_WGS84 (Loc_Pt) Attribute_Definition: Longitude WGS84: the longitude of the point location in decimal degrees in the WGS 84 geographic coordinate system. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -167.168884 Range_Domain_Maximum: -78.471161 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: Mat_Amnt (Production, Resources) Attribute_Definition: Material amount: the reported amount of Material. Calculated values are denoted by a "111" decimal trailer. Negative values indicate the material amount contains multiple commodities. For example, a deposit produces 87 tons of ore containing 7.3 percent copper, 7.4 troy ounces per ton silver, and 0.011 troy ounces per ton gold. Each commodity is listed as a separate record with a negative value of -87 in Mat_Amnt. Material amount ranges from 40 to 19,000,000,000 in the Production table with variable units. Material amount ranges from 1,200 to 3,373,600,000 in the Resources table with variable units (shown below). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1,200 Range_Domain_Maximum: 3,373,600,000 Attribute_Units_of_Measure: See Mat_Units. Attribute: Attribute_Label: Mat_Type (Production, Resources) Attribute_Definition: Material type: the type of Material reported by the source document for the mineral occurrence, mine feature, or mineral region. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: bulk material Enumerated_Domain_Value_Definition: Usually refers to industrial materials where estimates are given for weight or volumetric units. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: commodity Enumerated_Domain_Value_Definition: The final, valuable material that has been processed from the ore material; commonly expressed in sales units such as pounds, tons, troy ounces etc. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: concentrate Enumerated_Domain_Value_Definition: Enriched ore material collected after a removal of waste in a mill or concentrator. The rejected waste material is known as tailings. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: mill ore Enumerated_Domain_Value_Definition: An ore that needs preliminary treatment before it is of a sufficiently high grade to be acceptable for shipment or market. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: ore Enumerated_Domain_Value_Definition: The mixture of valuable and gangue materials. Ore is commonly represented in units of tons, metric tons, cubic yards, etc., and is typically associated with a grade(s) and (or) contained amount of the valuable material(s). Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Mat_Units (Production, Resources) Attribute_Definition: Material units: the units reported by the source document for the Material amount (Mat_Amnt) field. When appropriate these units may be changed by the USGS authors if calculations have been performed with the Mat_Amnt field. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: cubic meters Enumerated_Domain_Value_Definition: An SI unit of volume of a cube with edges of one meter in length. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: cubic yards Enumerated_Domain_Value_Definition: An imperial unit of volume of a cube with edges of one yard in length. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: kilograms Enumerated_Domain_Value_Definition: The SI base unit of mass. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: metric tons Enumerated_Domain_Value_Definition: An SI unit of mass equal to 1,000 kilograms. Also known as "tonnes". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: pounds Enumerated_Domain_Value_Definition: An imperial unit of mass equal to 16 ounces. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: short ton units Enumerated_Domain_Value_Definition: A unit of mass equal to 20 pounds. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: short tons Enumerated_Domain_Value_Definition: An imperial unit for mass that is equal to 2,000 pounds. Also known as "tons". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: tons Enumerated_Domain_Value_Definition: An imperial unit for mass that is equal to 2,000 pounds. Also known as "short tons". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: troy ounces Enumerated_Domain_Value_Definition: A unit for mass that is equal to 31.10348 grams. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: tonnes Enumerated_Domain_Value_Definition: An SI unit of mass equal to 1,000 kilograms. Also known as "metric tons". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: MatAmntSI (Production, Resources) Attribute_Definition: Material amount SI: the reported amount of Material in International System of Units (SI). Calculated values are denoted by a "111" decimal trailer. Negative values indicate the material amount contains multiple commodities. For example, a deposit produces 87 tons of ore containing 7.3 percent copper, 7.4 troy ounces per ton silver, and 0.011 troy ounces per ton gold. Each commodity is listed as a separate record with a negative value of -79.111 entered in Mat_Amnt. Metric values of material amount range from 0.003 to 14,718,724 in the Production table with variable units. Metric values of material amount range from 1,100 to 3,060,500,000 in the Resources table with variable units (shown below). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1,100 Range_Domain_Maximum: 3,060,500,000 Attribute_Units_of_Measure: See MatUnitsSI. Attribute: Attribute_Label: Material (Production, Resources) Attribute_Definition: Material: the Material reported by the source document for either production or resources. The format for this field is "material name (chemical formula)". Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "tungsten (W)" for an elemental commodity value, and "tungsten trioxide (WO3)" for a compound commodity value. Attribute: Attribute_Label: MatUnitsSI (Production, Resources) Attribute_Definition: Material units SI: the SI units of the Material amount (Mat_Amnt). Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: cubic meters Enumerated_Domain_Value_Definition: An SI unit of volume of a cube with edges of one meter in length. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: metric tons Enumerated_Domain_Value_Definition: An SI unit of mass equal to 1,000 kilograms. Also known as "tonnes". Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Min_Age (GeolMinOcc) Attribute_Definition: Mineralization age: the age of mineralization. Age is recorded as it was stated in the source document, which may be in the format of millions of years (Mega-annum [Ma]) or chronostratigraphic units. If multiple ages are reported, they are separated by semicolons and there will be an explanation in the Remarks field for each age. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "57 Ma", "72.0 +/- 2.6 Ma", "33-24 Ma" for millions of years, and "Tertiary" for chronostratigraphic units. Attribute: Attribute_Label: Min_Style (GeolMinOcc) Attribute_Definition: Mineralization style: how the valuable materials (Value_Mat) occur. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "skarn" for a single-entry record, and "skarn; veins" for a multiple entry record. Attribute: Attribute_Label: MinReg_ID (Loc_Pt, Site) Attribute_Definition: Mineral region identification: the unique identification assigned to a mineral region. The format for a mineral region is "Mr" followed by a 5-digit number. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Mr00001". Attribute: Attribute_Label: OBJECTID (All tables) Attribute_Definition: Object identification: an ArcGIS default field that contains an integer value to uniquely identify a row in an attribute table. Attribute_Definition_Source: Esri (2020) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 183 Attribute_Units_of_Measure: Integer Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: Other_Name (Loc_Pt, Site) Attribute_Definition: Other name: other reported name(s) of the mineral region, mineral occurrence, mine feature, or site. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "Mammoth" for a single-entry record, and "Gage; Mine Hill" for a multiple entry record. Attribute: Attribute_Label: Poly_Def (Loc_Pt) Attribute_Definition: Polygon definition: description of a polygon boundary. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples include "Approximate extent of mining district from the map" or "Approximate extent of the +0.030% to +0.090% Mo grade on the map". Attribute: Attribute_Label: Production (Site) Attribute_Definition: Production: indicates if production data for a site are available in the Production table. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: Information is available in the Production table. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: No information is available in the Production table. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Pt_Def (Loc_Pt) Attribute_Definition: Point definition: description of a point location. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples include "Approximate center of pit on imagery" or "Approximate location of Cold Spring shaft on the map". Attribute: Attribute_Label: Ref_Detail (Dep_Model, History, Loc_Poly_Sw, Loc_Pt, Production, Resources) Attribute_Definition: Reference detail: the figure, page, or map, etc. that data originate from. The format of this field is "Page number, Table/Figure number." If the figure, page, map, etc., number are not provided, data are captured in as complete a form as possible to direct the user to the proper location of the data within the source document. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "Page 2, Figure 2", "Figure 2", "Page 2", and "Plate 1". Attribute: Attribute_Label: Ref_ID (Descr_Sum, GeolMinOcc, History, Loc_Poly_Sw, Loc_Pt, Production, References, Resources) Attribute_Definition: Reference identification: a shortened reference identification of the source document. The field includes the authors last name(s) and year of publication. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "Kurtak (1998)" for a single author, "Cappa and Bartos (2007)" for two authors, and "Werner and others (2014)" for more than two authors. Attribute: Attribute_Label: Reference (References) Attribute_Definition: Reference: the Reference field is the full reference of the source report, reported according to the USGS citation format. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Information regarding USGS publishing may be found at https://www.usgs.gov/publishing. Attribute: Attribute_Label: Remarks (Dep_Model, Descr_Sum, GeolMinOcc, History, Loc_Poly, Loc_Poly_Sw, Loc_Pt, Production, Resources, Site) Attribute_Definition: Remarks: additional descriptive text or remarks provided by USGS authors. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Remarks are free-form entry provided by the USGS authors. Attribute: Attribute_Label: Resources (Site) Attribute_Definition: Resources: indicates if information for a site is available in the Resources table. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Yes Enumerated_Domain_Value_Definition: Information is available in the Resources table. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: No Enumerated_Domain_Value_Definition: No information is available in the Resources table. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Rsrc_Class (Resources) Attribute_Definition: Resource classification: the classification of the resource record as stated in the source document. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Indicated Enumerated_Domain_Value_Definition: The part of a mineral resource for which tonnage, densities, shape, physical characteristics, grade, and mineral content can be estimated with a reasonable level of confidence. It is indicated by information that is too widely or inappropriately spaced to confirm geological and (or) grade continuity but is spaced closely enough for continuity to be assumed. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Indicated plus Inferred Enumerated_Domain_Value_Definition: A term used for the sum of indicated plus inferred classifications. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Inferred Enumerated_Domain_Value_Definition: The part of a mineral resource for which tonnage, grade, and mineral content can be estimated with a low level of confidence. It is inferred from geological evidence and assumes, but does not verify, geological and (or) grade continuity. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Measured Enumerated_Domain_Value_Definition: The part of a mineral resource for which tonnage, densities, shape, physical characteristics, grade, and mineral content can be estimated with a high level of confidence. It is measured using information from locations spaced closely enough to confirm geological and (or) grade continuity. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Measured plus Indicated Enumerated_Domain_Value_Definition: A term used for the sum of measured plus indicated classifications. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Probable Enumerated_Domain_Value_Definition: A reserve for which quantity and grade and (or) quality are computed from information similar to that used for a proven reserve, but the sites for inspection, sampling, and measurement are farther apart or are otherwise less adequately spaced. The degree of assurance, although lower than that for a proven reserve, is high enough to assume continuity between points of observation. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Proven Enumerated_Domain_Value_Definition: Reserves of metallic and nonmetallic minerals, and of oil and gas, for which reliable quantity and quality estimates have been made. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Proven plus Probable Enumerated_Domain_Value_Definition: A term used for the sum of proven plus probable classifications. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: R1E - Economically exploitable Enumerated_Domain_Value_Definition: The in-situ resources in deposits that have been examined in sufficient detail to establish their mode of occurrence, size and essential qualities within individual ore bodies. The major characteristics relevant to mining and processing, such as the distribution of ore grade, the physical properties that affect mining, the mineralogy and deleterious constituents, are known mainly by direct physical penetration and measurement of the ore body combined with limited extrapolation of geological, geophysical and geochemical data. Those in-situ resources that are considered to be exploitable in a particular country or region under the prevailing socioeconomic conditions with available technology. Enumerated_Domain_Value_Definition_Source: Schanz (1980) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: R1M - Marginally economic Enumerated_Domain_Value_Definition: The in-situ resources in deposits that have been examined in sufficient detail to establish their mode of occurrence, size and essential qualities within individual ore bodies. The major characteristics relevant to mining and processing, such as the distribution of ore grade, the physical properties that affect mining, the mineralogy and deleterious constituents, are known mainly by direct physical penetration and measurement of the ore body combined with limited extrapolation of geological, geophysical and geochemical data. Those in situ resources that may become exploitable in the more immediate future - perhaps within a decade - as a result of normal or anticipated changes in economic or technical circumstances. Enumerated_Domain_Value_Definition_Source: Schanz (1980) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: R1S - Subeconomic Enumerated_Domain_Value_Definition: The in-situ resources in deposits that have been examined in sufficient detail to establish their mode of occurrence, size and essential qualities within individual ore bodies. The major characteristics relevant to mining and processing, such as the distribution of ore grade, the physical properties that affect mining, the mineralogy and deleterious constituents, are known mainly by direct physical penetration and measurement of the ore body combined with limited extrapolation of geological, geophysical and geochemical data. The balance of the in-situ resources that is not considered of current interest but may become of interest as a result of foreseeable economic or technologic changes. Enumerated_Domain_Value_Definition_Source: Schanz (1980) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Unclassified Enumerated_Domain_Value_Definition: A term used to identify records that do not have publicly available resource classifications available. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Rsrc_Code (Resources) Attribute_Definition: Resource code: the standard classification system used to classify and report the resource estimate. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: CIM Enumerated_Domain_Value_Definition: The CIM (Canadian Institute of Mining, Metallurgy and Petroleum) Definition Standards on Mineral Resources and Reserves (CIM Definition Standards) establish definitions and guidance on the definitions for mineral resources, mineral reserves, and mining studies used in Canada. The Mineral Resource, Mineral Reserve, and Mining Study definitions are incorporated, by reference, into National Instrument 43-101 Standards of Disclosure for Mineral Projects (NI 43-101). The CIM Definition Standards can be viewed on the CIM website at www.cim.org. Enumerated_Domain_Value_Definition_Source: Canadian Institute of Mining, Metallurgy and Petroleum (2014) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: JORC Enumerated_Domain_Value_Definition: The Australian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves ('the JORC—Joint Ore Reserves Committee—Code') is a professional code of practice that sets minimum standards for Public Reporting of minerals Exploration Results, Mineral Resources and Ore Reserves. The JORC Code provides a mandatory system for the classification of minerals Exploration Results, Mineral Resources and Ore Reserves according to the levels of confidence in geological knowledge and technical and economic considerations in Public Reports. Enumerated_Domain_Value_Definition_Source: http://www.jorc.org/ Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: SEC Enumerated_Domain_Value_Definition: U.S. Securities and Exchange Commission filings. The most common SEC form used in this database is a 10-K Annual report pursuant to Section 13 or 15(d). Enumerated_Domain_Value_Definition_Source: https://www.sec.gov/ Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: UNRC Enumerated_Domain_Value_Definition: United Nations Resource Classification - Three basic categories, identified as R-1 , R-2, and R-3. These three categories are differentiated according to the level of geological assurance that can be assigned to each category. Enumerated_Domain_Value_Definition_Source: Schanz (1980) Attribute: Attribute_Label: Rsrc_Date (Resources) Attribute_Definition: Resource date: the 4-digit year of the resource record. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "2019". Attribute: Attribute_Label: Rsrc_Descr (Resources) Attribute_Definition: Resource description: the resource classification category, such as resources or reserves. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: In Situ Resource Enumerated_Domain_Value_Definition: The "in place" material that defines a resource for a deposit. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Ore Reserve Enumerated_Domain_Value_Definition: The economically mineable part of a measured mineral resource or indicated mineral resource. It includes diluting materials and allowances for losses that may occur when the material is mined. Appropriate assessments, which may include feasibility studies, have been carried out, and include consideration of and modification by realistically assumed mining, metallurgical, economic, marketing, legal, environmental, social, and governmental factors. These assessments demonstrate at the time of reporting that extraction could reasonably be justified. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Reserves Enumerated_Domain_Value_Definition: The part of a mineral deposit which could be economically and legally extracted or produced at the time of the reserve determination. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Resources Enumerated_Domain_Value_Definition: A concentration of naturally occurring solid, liquid, or gaseous material in or on the Earth's crust in such form and amount that economic extraction of a commodity from the concentration is currently or potentially feasible. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Unclassified Enumerated_Domain_Value_Definition: A term used to identify records that do not have resource descriptions publicly available. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Shape (Loc_Poly, Loc_Poly_Sw, Loc_Pt) Attribute_Definition: Shape: an ArcGIS default field that contains the geometry type (point, line, polygon). Attribute_Definition_Source: Esri (2020) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Point Enumerated_Domain_Value_Definition: Geometry type is a point. Enumerated_Domain_Value_Definition_Source: Esri (2020) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Polygon Enumerated_Domain_Value_Definition: Geometry type is a polygon. Enumerated_Domain_Value_Definition_Source: Esri (2020) Attribute: Attribute_Label: Shape_Area (Loc_Poly, Loc_Poly_Sw) Attribute_Definition: Shape area: an ArcGIS default field that contains the area of a polygon. The value is automatically generated in units of the feature class. Attribute_Definition_Source: Esri (2020) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 16.431475 Attribute_Units_of_Measure: Degree Attribute_Measurement_Resolution: 0.000001 Attribute: Attribute_Label: Shape_Length (Loc_Poly, Loc_Poly_Sw) Attribute_Definition: Shape lenght: an ArcGIS default field that contains the length of a line or perimeter. The value is automatically generated in the units of the feature class. Attribute_Definition_Source: Esri (2020) Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.005089 Range_Domain_Maximum: 28.544202 Attribute_Units_of_Measure: Degree Attribute_Measurement_Resolution: 0.000001 Attribute: Attribute_Label: Site_ID (Dep_Model, Descr_Sum, GeolMinOcc, History, Loc_Poly, Loc_Pt, Production, Resources, Site) Attribute_Definition: Site identification: the unique alpha-numeric identification assigned to a site. The format for this field is a two-letter state abbreviation followed by a 5-digit number. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "AK00001". Attribute: Attribute_Label: Site_Name (Site) Attribute_Definition: Site name: the name that best represents the grouping of mine and/or mineral occurrence features, or mineral regions of an area. Site names often take on the primary name of the deposit or mine that the site was created for. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Climax". Attribute: Attribute_Label: StatDetail (History) Attribute_Definition: Status detail: a description of the activity that occurred during a specified time period, as shown in the Year from (Year_From) and Year to (Year_To) fields. The StatDetail describes the Status field value. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "Deposit discovered in 1903". Attribute: Attribute_Label: State (Loc_Poly_Sw, Loc_Pt) Attribute_Definition: State: the U.S. state name using 2-letter abbreviations. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "AK". Attribute: Attribute_Label: Status (History) Attribute_Definition: Status: the type of activity that took place during a specified time period, as shown in the Year from (Year_From) and Year to (Year_To) fields. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Active Enumerated_Domain_Value_Definition: Indicates a mine is in full-time or intermittent production or is selling from stockpiles. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Development Enumerated_Domain_Value_Definition: Indicates planning and studies are in progress or have been completed for the development of the mine, or that a mine is actively under development. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Discovery Enumerated_Domain_Value_Definition: The actual finding of a valuable mineral, indicative of a deposit. Legally, a discovery is a prerequisite to making a mining claim on an area. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Evaluation Enumerated_Domain_Value_Definition: The fixing of an evaluation, not an appraisal. Used in preference of the word valuation, which is often confused with appraisal. Enumerated_Domain_Value_Definition_Source: American Geosciences Institute (1997) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Exploration Enumerated_Domain_Value_Definition: The search for deposits of useful minerals or fossil fuels. It may include geologic reconnaissance, e.g. remote sensing, photogeology, geophysical and geochemical methods, and both surface and underground investigations. Establishing the nature of a known mineral deposit, preparatory to development. In the sense that exploration goes beyond discovery, it is a broader term than prospecting. Enumerated_Domain_Value_Definition_Source: Neuendorf and others (2011) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Inactive Enumerated_Domain_Value_Definition: Indicates that a mine is not in production, is on care and maintenance, or is under reclamation. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Intermittent Exploration Enumerated_Domain_Value_Definition: The process of exploration that occurs at irregular intervals; not continuous or steady. Enumerated_Domain_Value_Definition_Source: USGS Authors Attribute: Attribute_Label: Value_Mat (GeolMinOcc) Attribute_Definition: Valuable material: the minerals or rocks that are the material(s) that comprise the valuable constituent(s) of a deposit. These material(s) are reported as they are presented in the source document. Where materials are listed with parentheses "(element)", these materials have been identified as valuable materials where host minerals are not specified in the source document. An example for this would be "gold (element)". Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: Examples for this field are "scheelite" for a single entry, and "scheelite; sphalerite" for a multiple entry record. Attribute: Attribute_Label: Year_From (History, Production) Attribute_Definition: Year from: the initial year for a history or production record. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "1975". Attribute: Attribute_Label: Year_To (History, Production) Attribute_Definition: Year to: the last year for a history or production record. Attribute_Definition_Source: USGS Authors Attribute_Domain_Values: Unrepresentable_Domain: An example for this field is "1980". Overview_Description: Entity_and_Attribute_Overview: The entity and attribute information provide the tabular data associated with the data set. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the data set. Entity_and_Attribute_Detail_Citation: The entity and attribute information are generated by the individual and (or) agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - ScienceBase Contact_Person: USGS Information Services Contact_Address: Address_Type: mailing address Address: Building 810, Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Country: United States of America Contact_Voice_Telephone: 1-888-ASK-USGS (1-888-275-8747) Contact_Electronic_Mail_Address: sciencebase@usgs.gov Distribution_Liability: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Digital Data Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P97NJLI4 Fees: None. No fees are applicable for obtaining the data set. Metadata_Reference_Information: Metadata_Date: 20200831 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Carma A. San Juan Contact_Organization: U.S. Geological Survey, Rocky Mountain Region Contact_Position: Physical Scientist Contact_Address: Address_Type: mailing address Address: PO Box 25046, Mail Stop 973 City: Lakewood State_or_Province: CO Postal_Code: 80225 Country: US Contact_Voice_Telephone: 303-236-2450 Contact_Facsimile_Telephone: 303-236-3200 Contact_Electronic_Mail_Address: csanjuan@usgs.gov Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998